Cooling system for motor fire-engines



R. S. BOLGER.

COOLING SYSTEM FOR MOTOR FIRE ENGINES. APPLICATloN FILEDJUNE24,1919.

III

/I TTOHNE YS Patented Mar. 30, 1920.

UNITED sTATEs PATENT OFFICE- ROBERT S. BOLGER, OF NEW YORK, N. Y., ASSIGNOR TO INTERNATIONAL MIOTORCOM- .PANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE. v

COOLING SYSTEM Fon MoronTIRE-ENGINEs T o all whom 'it may concern: l

Be it known that I, ROBERT S. BOLGER, a citizen of the 'United States, whose residence and post-office address is Richmond Hill, in

the borough of Queens of the city of New York, inthe State of New York, have invented certain new and useful Improvements in Cooling Systems for Motor Fire- Engines, of which the following is a specification, reference being had to the acco-'nipanying drawing, forming a part hereof.

In motor propelled fire engines the discharge, for a motor of given rating, is dependent upon the horse power delivered at the pump. Accordingly, it is 'desirable when the motor is employed for driving the fire pump, that all unnecessary loss of power through the diversion of some of the motor power to its associated elements, be reduced to a minimum. It is theprincipal object of this invention to save the power usually em- *ployedy in driving the water pump of the circulating system for the motor by render ing this pump inoperative during the use of' the fire pump, in the sense that the water pump for the circulating system is not relied upon to force the cooling water through' the l jackets of the motor. A further object of the invention is to cool the motor by water taken from the lire hose during the use of the fire pump so that when the/motor is under its heaviest duty it will be cooled constantly by water at about the temperature of the main.

The invention will be described in one embodiment in a motor fire engine in connection with the accompanying drawing in whlch- Figure l is a view in side elevation of so much of a motor fire engine as is necessaryA for an understanding of; the application of the improved cooling system thereto.

Fig. 2`i`s a view on a larger scale of the motor lire engine shown in Fig. l, the hood and dash being removed in the interest of clearness.

The truck a carries, as usual, a propelling internal combustion engine Z), the 'cooling circulatory system of which includes a water pump c connected through a hose d with the water jackets Z1 of the motor anda return l connection to the pump indicated as a' hose 'i es.

-'may drip from the pipef Specification of Letters Patent. 7 Patented 151,13 30, 1920 Application filed June 24,

vided with an overflow pipe f, as is usual. In accordance with the present invention the lire pump indicated generally at g is connected preferably, on its outlet side' g through a pipe it to some point of the water clrculatory system, such as the pipe d leading to the cylinder. jackets. On the other side of the fire pump g, as at the inlet g2, there is a pipe connection z' to another portion of the water circulatory system, such as the overflow pipe f. sirable, pressures' in the pipes g o2, of the fire pump to include in the connecting pipes l1., z', suitable pressure and vacuum regulators-lz', z", respectively. In the particular embodiment of the apparatus illustrated, it will be evi'- dent that the water flowing from the outlet g into the pipe h will be under a pressure and water returning to the inlet side g2 through the pipe z' will 4be subjected to a negative pressure. The rate of flow through these pipes, accordingly, can well be controlledy by the' pressure and. vacuum regulators It', z" referred to. j

lVhen the fire pump g is not' in use, as during the propulsion'of the truck a, the improved cooling system may be cut ofi from able valves h2, 2 located within the connecting pipes 7i, z' respectively. At this time the pump c will be connected tothe circulatory system through a valve ai', conveniently 'located within-the connecting pipe d, sucha valve being desirable for-reasons which will appear, although it is to be understood that this valve may be omitted and the benefits of the invention realized to a very substantial extent. VVhenthe motor b is in normal use any 'excess of water in the reservoir f past 4an opened valve f2 whichimay be located at the llower end thereof. When the fire pump `is in operation, `it will be desirable to render the water pump o for the cooling system inoper- .ative in the sense thatl no `appreciable power from the moter is required to drive it, so that the power ordinarily thus consumed may be delivered to the re lpump in form It is ordinarily deowing to the relatively high water the usual circulatory system by closing suitthe valves h2, 2 are opened and the Valve 2 in the overflow pipe f is closed. At this l time some water is taken from the outlet side g of the pump g and delivered to the cooling system of the motor through the pipe h passing from the motor into the reservoir f and returning to' the inlet side g2 of the pump through the pipesA f", c'. The pressure regulator h and vacuum regulator i will so control the rate of flow of the water through the circulatory system as to insure a steady flow therethrough of such volume as is best adapted for the capacity of the circulating system. With the parts in the conditions described it water pump o will merely idle. The power ordinarily employed to drive the pump` c is thereby saved to the motor and consequently delivered to the pump g in form for useful work. This condition may possibly be bettered by closing ofi' the pipey d' from the pump c, as by means of the' valve d', in which casethe pump c not only idlesbut is protected from any counter pressure which mightbe set up by the water flowing in through the pipe k. p

It is to be understood that the inventionis not to be limited to the precise embodiment illustrated nor to the arrangement of the pipes and valves described since it is evident that the advantages might be realized in other constructions which will produce the desired results. F or instance, the pipe connections h, z', might be reversed and the inflowing and outfiowing water connections might be had at other parts of the system than those shown.

The scope of the invention is defined by the accompanying claims.

I claim as my invention: I l. In motor fire engines, in combination with the motor and cooling system therefor, a fire pump, inflow and return connections from the opposite sides of the pumpto the cooling system to impress positive and negative pressures on the inlet and outlet, re'- spectively, of the cooling system and means to cut off said connections from the coolingl system.

is evident that the means to cut off said connections from the cooling system. y

3. In motor fire engines, in combination with the motorand cooling system therefor, a fire pump, inflow and return connections fr om the pump to the cooling system on the outlet and inlet sides thereof, respectively,

, pressure and vacuum regulating devices in the inflow and return connections, respectively, and means to cut off said connec- Y tions from the cooling system.

4. In motor fire engines, in combination with the motor and cooling system therefor, a fire pump, a water circulatory pump in the cooling system, a connection from the fire pump 'to the cooling system at a point i between the circulatory pump and the motor, a water reservoir in the system, a return connection therefrom to the circulatory pump, a return connection from the reservoir to the fire pump and means to vcut off the connections from'the fire pump.

5. In motor fire engines, in combination with the motor and cooling system therefor, a fire pump, a Water circulatory pump, a connection from the lastl named pump to the motor, a connection from he fire pump to the last named-connectio a valve between the water circulatory pump and the point of connection of the fire pump to the circulatory system, a water reservoir in the system, a return connection therefrom to the circulatory pump, an overflow pipe for the reservoir, a return connection from the fire pump to the overflow pipe, a valve to close the overflow pipe lat a point beyond its connection with the fire pump, valves to-cutoff the connections; between the firepump and the circulatory `system and devices for regulating the flow of Water from the fire pump to the circulatory system. This'specification signed this June, A. D., 1919i RBERT S. BOLGER.

21st day of 

